Sitting in radioactive dirt was a thing in the 1950s

 "No wonder so many comic book superheroes got their superpowers from radioactivity. In the 1950s. some people thought uranium dirt was good medicine. Uranium dirt houses in Texas would charge sick people $2 to sit or lay down in the stuff. They also sold uranium dirt to go. 

This 1955 Life magazine article has some great dirt house photos, including signs for the "uranitoriums""

Sitting in radioactive dirt was a thing in the 1950s - Boing Boing

"Uranium Sand Baths" at Corydon